Improvement in concrete pavements



J. 'H -TuunMANN a F. BnuMsHAGEN.

Concrete-Pavement.

Patented Aug. 10, i875.

MFEKERS. FHGYWLITMDGRAFMER. WASHXNGTO'N. D. C, 4

NITED STATES TENT EErQ JOHN H. THORMANN AND FRIEDRICH BRUMSHAGEN, OFBALTIMORE, MARYLAND.

IMPROVEMENT IN CONCRETE PAVEMENTS.

Specification forming part of Letters Patent No. 166,486. dated Augustl0, 1875; application filed July 22, 1875.

To all whom it may concern:

Be it known that we, JOHN H. THORMANN and FRIEDRICH BRUMSHAGEN, both ofBaltimore, in the county of Baltimore and State of Maryland, haveinvented a certain Improvement in Concrete Pavements, of which thefollowing is a specification:

Our invention relates to that class of concrete pavements or floorswhich are laid in sections in imitation of stone-tiagging. Itisdesirable always, and in many cases indispensable, to make the jointsbetween the blocks water-tight; and various methods have been adoptedand patented for accomplishing this end, but none known so far has metall the requirements.

Our improvement is intended to provide water-tight joints between theblocks without rigidly cementing them together, so that the separateblocks may be readily taken up, and may separately yield to possibleslight upheavals of the foundation-bed caused by frost, Without anyinjury to the blocks or to the joints. It consists in lling the joints,in the manner hereafter stated, with white lead.

In the annexed drawings, Figure l is a perspective view of a concreteflag pavement, embodying` our invention. of the same.

In laying a concrete flag pavement in accordance with our invention, weproceed to mold, say, every alternate block or iiag of a row, directlyupon the foundation-bed, as

Fig. 2 is a section l usual. As soon as the material of which the flagsare composed (we employ usually a mixture of cement and sand, but do notconfine ourselves to any particular paving composition) has setsufficiently, we mold the intervening flags; but before doing so apply athick layer of thick white lead to the adjacent edges of the iiagsalready down, and then work the intervening ags close up against theselayers of White lead.

We have found, by actual experiments, that joints thus formed are andremain perfectly water-tight. The lead acts in a measure like putty, andthe ilags may be readily separated from each other when it becomesnecessary to take up one or more. The joints also are sufficientlyelastic to allow the very slight, independent movements of the dagscaused by upheavals of the ground from frost.

What we claim as our invention, and desire to secure by Letters Patent,is

A pavement or iloor composed of concrete iiags or blocks, separated byinterposed layers of white lead, substantially as and for the purposespecified.

In testimony whereof we have have signed our names to the foregoingspecification in the presence of two subscribing witnesses.

JOHN H. THORMANN. FRIEDRICH BRUMSHAGEN. Witnesses:

JOHN E. LANG-HOE, CHARLES LH/HSEHG.

